7. Other information
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7.7.2 Anti-icing protection by switching off the compressor with a ro-
bot
Protection against icing is provided by the robot switching off the compressor. (Thus,
the robot controls the cooling capacity, or releases the compressor only after a cer-
tain amount of milk).
As long as the digital input is bridged, the compressor remains switched off.
To use this function, parameter [A21] must be set to 3.
Robot:
On the robot a corresponding switch contact must be available and set.
7.7.3 Anti-Icing protection by means of low pressure monitoring
The controller can be used to set up "anti-icing protection" via the low pressure mon-
itoring of the compressor.
For this purpose, a low-pressure switch must be connected to the digital input of the
controller and parameterised.
Note: For the "anti-icing" function, the correct switch-off pressure must be set on the
low-pressure switch.
Settings:
Setting of function digital input [A21 = 4]
Setting of the type of switching contact of the low-pressure switch [P84]:
1: Compressor off when digital input is closed
2: Compressor off when digital input is open
If the low-pressure switch reports "pressure undercut", the compressor is switched
off for the pre-set time [P88].
When the compressor restarts, the low-pressure switch query is suppressed by the
set time [P87] (to prevent the compressor from switching off again due to system-
related pressure fluctuations in the evaporator)
Via [P89] can be set whether the low pressure monitoring is to be permanent or
temporally limited.
The advantage of permanent monitoring is that even the loss of cooling agent is
detected!
NOTICE
NOTICE
